Highest temperature in London on July 15?

Platform comparison

Market context

London City Airport is set to record its peak temperature for 15 July 2026, with the market betting on whether that figure falls within a specific Celsius range. Today’s conditions show 13°C at the station, but the settlement window remains open until midday UTC tomorrow, leaving the final high dependent on afternoon solar intensity and cloud cover. The crowd-implied probability of 0% YES suggests traders believe the temperature will fall outside the offered range, likely due to expectations of a cooler day or a range mismatch with historical norms.

Historical July highs at London City Airport typically range between 22°C and 32°C, with extreme heatwaves pushing above 35°C, as seen in 2022. A 0% implied probability is unusual for a weather contract unless the range is implausibly narrow or misaligned with forecast models. Comparable cases from Polymarket show similar weather markets often correct sharply once local forecasts stabilise, especially when initial odds ignore seasonal averages or recent trend data from Wunderground.

Traders should monitor the Met Office’s 24-hour forecast updates for London and the live Wunderground history feed, which will determine the final resolution. Any sudden shift in southerly wind patterns or cloud density could alter the peak temperature significantly. Recent BBC Weather data indicates falling pressure and moderate visibility, which may limit daytime heating. Analyst consensus across prediction platforms currently diverges from the 0% line, suggesting a potential arbitrage opportunity if the range is mispriced relative to forecasted highs.

Sources: 1 · 2 · 3

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.